參數(shù)資料
型號(hào)： ADXL50JH
廠(chǎng)商： ANALOG DEVICES INC
元件分類(lèi)： 模擬信號(hào)調(diào)理
英文描述： Monolithic Accelerometer With Signal Conditioning
中文描述： SPECIALTY ANALOG CIRCUIT, MBCY10
封裝： HERMETIC SEALED, METAL CAN, TO-100, 10 PIN
文件頁(yè)數(shù)： 4/16頁(yè)
文件大?。?/td> 286K
代理商： ADXL50JH
ADXL50
–4–
REV. B
Polarity of the Acceleration Output
T he polarity of the ADX L50 output is shown in the Figure 1.
When oriented to the earth’s gravity (and held in place), the
ADX L50 will experience an acceleration of +1 g. T his corre-
sponds to a change of approximately +19 mV at the V
PR
output
pin. Note that the polarity will be reversed to a negative going
signal at the buffer amplifier output V
OUT
, due to its inverting
configuration.
Mounting Considerations
T here are three main causes of measurement error when using
accelerometers. T he first two are alignment and transverse sen-
sitivity errors. T he third source of error is due to resonances or
vibrations of the sensor in its mounting fixture.
E rrors Due to Misalignment
T he ADX L50 is a sensor designed to measure accelerations that
result from an applied force. Because these forces act on the
sensor in a vector manner, the alignment of the sensor to the
force to be measured may be critical.
T he ADX L50 responds to the component of acceleration on its
sensitive X axis. Figures 2a and 2b show the relationship be-
tween the sensitive “X ” axis and the transverse “Z” and “Y”
axes as they relate to the T O-100 package.
Figure 2c describes a three dimensional acceleration vector
(A
X YZ
) which might act on the sensor, where A
X
is the compo-
nent of interest. T o determine A
X
, first, the component of accel-
eration in the X Y plane (A
X Y
) is found using the cosine law:
A
X Y
=
A
X YZ
(
cos
θ
X Y
)
then
A
X
=
A
X Y
(cos
θ
X
)
Therefore: Typical V
PR
=
19
mV
/
g
(
A
X YZ
)
(cos
θ
X Y
) cos
θ
X
Note that an ideal sensor will react to forces along or at angles
to its sensitive axis but will reject signals from its various trans-
verse axes, i.e., those exactly 90
°
from the sensitive “X ” axis.
But even an ideal sensor will produce output signals if the trans-
verse signals are not exactly 90
°
to the sensitive axis. An accel-
eration that is acting on the sensor from a direction different
from the sensitive axis will show up at the ADX L50 output at a
reduced amplitude.
T able I. Ideal Output Signals for Off Axis Applied
Accelerations Disregarding Device Alignment and
T ransverse Sensitivity E rrors
% of Signal Appearing
at Output
Output in gs for a 50 g
Applied Acceleration
θ
X
0
1
°
2
°
3
°
5
°
10
°
30
°
45
°
60
°
80
°
85
°
87
°
88
°
89
°
90
°
100%
99 98%
99.94%
99.86%
99.62%
98.48%
86.60%
70.71%
50.00%
17.36%
8.72%
5.25%
3.49%
1.7%
0%
50 (On Axis)
49.99
49.97
49.93
49.81
49.24
43.30
35.36
25.00
8.68
4.36
2.63
1.75
0.85
0.00 (T ransverse Axis)
+1g
TAB
PIN 5
Figure 1. Output Polarity at V
PR
Z
Z
X
TRANSVERSE Z AXIS
SENSITIVE (X) AXIS
SIDE VIEW
X
TAB
PIN 5
Figure 2a. Sensitive X and Transverse Z Axis
TRANSVERSE Y AXIS
TOP VIEW
Y
X
Y
SENSITIVE (X) AXIS
X
TAB
PIN 5
Figure 2b. Sensitive X and Transverse Y Axis
θ
x
θ
xy
Y Axis
X Axis
Axy
Ax
Axyz
–Z Axis
Figure 2c. A Vector Analysis of an Acceleration Acting
Upon the ADXL50 in Three Dimensions
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